The 1924 United States immigration act specifically exempted from quota restriction professors and ministers of any religion as well as their wives and minor children.
Section 4(d) An immigrant who continuously for at least two years immediately preceding the time of his application for admission to the United States has been, and who seeks to enter the United States solely for the purpose of, carrying on the vocation of minister of any religious denomination, or professor of a college, academy, seminary, or university; and his wife, and his unmarried children under 18 years of age, if accompanying or following to join him…
 Roger Daniels, “Immigration,” Encyclopedia of the New American Nation, (http://www.americanforeignrelations.com/E-N/Immigration.html : accessed 14 August 2015).
 “Non-Quota Immigrants,” Public Laws of the Sixty-Eighth Congress of the United States. Sess. I, Chapter 190. 1924, p.155, (http://www.legisworks.org/congress/68/publaw-139.pdf : accessed 14 August 2015).